Credit Score Management

i have had terrible credit in the past and have being paying off most of my debts i am finally getting my head above water but everything i apply for even a switch card is being refused help needed! frustration setting in.

I am interested in finding a credit repair company that has proven to have a very positive impact on your credit score. I know that the best way is to do it yourself so I would not like to hear responses from people who have no actual company in mind. Thank you.